A) different ova
B) different sperms
C) different zygote
D) same zygote
Correct Answer: D
Solution :
Twin offsprings can either be identical (monozygolic) or fraternal (dizygotic). In monozygoric, twin develop from same zygote that splits and forms two embryos. In dizygotic, twin develop from two separate eggs that are fertilized by two separate sperms. Identical twins are genetically identical and they are always of same sex. In fraternal twins, two genetically different ova are fertilized by two genetically different sperms.
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